Simulation Research On Electronic-controlled Fuel Injection System Of 16V280ZJ Diesel

Along with the increasingly shortage of petroleum resource and aggravation of environmental pollution, as well as stringent exhaust emission standards, the development of Internal Combustion Engine is facing with more and more severe challenge. The fuel economy of diesel engine is 20-30% better than gasoline engine, but its major problems are the higher level of NOx and Soot emission. In order to satisfy with the European IV, European IV regulation, researchers at home and abroad returned to focus on the combustion progress. Using the electronic-controlled system to realize multiple injections, which improved the diesel engine combustion process, gradually become the research hot spot.Applying the GT-FUEL and GT-POWER software established separately the 16V280ZJ diesel engine's electrically controlled fuel injection system simulation mold and engine simulation model. GT-FLOW software which works as simulation platform couples the two simulation models, and established the coupled simulation model. Using the model studyed injection pressure, feed advance angle as well as multiple injections on engine emission and performance effect.Through the research injection pressure, feed advance angle discovered to the diesel engine emission and performance effect: Adopts high injection pressure and small feed ahead of time union may reduce the emission of diesel engine to a certain extent, but facing higher request's emission standard and laws, such adjustment appears helpless. Therefore, decided that uses multiple injections to further improve diesel engine's emission behavior repeatedly, and has proved its feasibility through the analog computationMultiple injections to the diesel engine combustion and emission effect simulator study indicated: Pilot injection can reduce NOx, Soot as well as noise. However, the injection timing and volume is sensitive, so the pilot parameters requires a careful choice. A proper pilot injection has an effect to shorten the ignition delay period and in-cylinder pressure. With a moderate pilot injection advance angle, the ignition delay period can be shortened, there by reduced the volume of premixed combustion reducing the peak heat release rate and hence NOx, as well as combustion noise. As for post injection, it releases heat to raise the temperature in cylinder. All of which enhanced the oxidation rate of soot, resulting in the final soot emission reduction. But excess post injection would induce fuel consumption increasing and exhaust temperature rising. Therefore the post injection quantity and interval must be regulated and optimizing carefully.In a word, simulation optimum study of 16V280ZJ diesel engine were carried out under different multiple injection schemes in the thesis. The performance and emission of engine were improved effectively, and the better results were achieved. On the other hand, it provides theoretical and experimental foundation for the further research and wide application.